I believe that the reference to 13:22 below inappripriately goes to Acts 13:22 rather than Hebrews 13:22
"But the same term is used in Hb. for the “word of exhortation” (13:22) to men of long standing in the faith, though in danger of growing weary."
, vol. 5, Theological Dictionary of the New Testament, ed. Gerhard Kittel, Geoffrey W. Bromiley and Gerhard Friedrich, electronic ed. (Grand Rapids, MI: Eerdmans, 1964-), 795.